Distinguish between speed and velocity. State their CGS and SI units.

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Solution

Speed
Velocity
1.Speed is the distance travelled by the body in one second. 1.Velocity is the distance travelled by the body in a second in a particular direction.
2.Speed is a scalar quantity. 2.Velocity is a vector quantity.
3.It can be positive or zero. 3.It can be positive ,negative or zero .
4.SI unit of speed is $\frac{m e t r e}{s e c o n d}$ . 4.SI unit of velocity is $\frac{m e t r e}{s e c o n d}$ .
5. CGS unit of speed is $\frac{c e n t i m e t r e}{s e c o n d}$ . 5. CGS unit of velocity is $\frac{c e n t i m e t r e}{s e c o n d}$ .

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Speed	Velocity
1.Speed is the distance travelled by the body in one second.	1.Velocity is the distance travelled by the body in a second in a particular direction.
2.Speed is a scalar quantity.	2.Velocity is a vector quantity.
3.It can be positive or zero.	3.It can be positive ,negative or zero .
4.SI unit of speed is $\frac{m e t r e}{s e c o n d}$ .	4.SI unit of velocity is $\frac{m e t r e}{s e c o n d}$ .
5. CGS unit of speed is $\frac{c e n t i m e t r e}{s e c o n d}$ .	5. CGS unit of velocity is $\frac{c e n t i m e t r e}{s e c o n d}$ .